However, more companions might be revealed by ongoing and future searches at H \(\alpha \)  with various instruments.
One is Subaru/SCExAO+VAMPIRES ([1]}, [2]}), with \(R\gtrsim 1000\) . Another is VLT/MUSE, which provides at H \(\alpha \)  in narrow-field mode (NFM) the currently highest available spectral resolution of
\(R=2516\) , corresponding to an instrumental spectral full width at half maximum (FWHM) of \(\approx 0.26\)  nm (see for example Figure B.3 of [3]}).
A similar resolution will be afforded by
HARMONI, the first-light spectrograph on the Extremely Large Telescope (ELT)See http://harmoni-elt.physics.ox.ac.uk.
[4]}, [5]}, with \(R\approx 3300\)  blueward of 0.8 \(\) m.
